0

在调试下面发布的代码时，我决定将 aToast放在if语句的主体和语句的主体中else，这样我就可以看到错误来自哪里。当我运行应用程序时，我发现两者Toasts都被执行了。最初显示语句Toast内if，几秒钟后显示切换到语句Toast内，else并且它们保持交替。我不知道如何将条件同时评估为真和假。请提供合乎逻辑的解释和建议来解决这个问题。

Java代码：

public void onSensorChanged(SensorEvent event) {
    // TODO Auto-generated method stub
    switch (event.sensor.getType()) {
    case Sensor.TYPE_ACCELEROMETER:
        accelerometerValues = event.values.clone();
        tvAcc_XReading.setText(Float.toString(accelerometerValues[0]));
        tvAcc_YReading.setText(Float.toString(accelerometerValues[1]));
        tvAcc_ZReading.setText(Float.toString(accelerometerValues[2]));
    case Sensor.TYPE_MAGNETIC_FIELD:
        magnetometerValues = event.values.clone();
        tvMagneto_XReading.setText(Float.toString(magnetometerValues[0]));
        tvMagneto_YReading.setText(Float.toString(magnetometerValues[1]));
        tvMagneto_ZReading.setText(Float.toString(magnetometerValues[2]));
    }
    if (accelerometerValues != null && magnetometerValues != null) {
        float [] matrixR = new float[9];
        float [] matrixI = new float[9];
        boolean success = SensorManager.getRotationMatrix(matrixR, matrixI, accelerometerValues, 
                magnetometerValues);
        if (success) {
            Toast.makeText(getApplicationContext(), "SUCCESS", Toast.LENGTH_LONG).show();
            float [] orientationMatrix = new float[3];
            SensorManager.getOrientation(matrixR, orientationMatrix);
            tvAzimuthReading.setText(Float.toString(orientationMatrix[0]));
            tvPitchReading.setText(Float.toString(orientationMatrix[1]));
            tvRollReading.setText(Float.toString(orientationMatrix[2]));
        } else {
            Toast.makeText(getApplicationContext(), "No Rmatrix", Toast.LENGTH_LONG).show();
        }
    }
4

1 回答 1

0

尝试在您的案例中添加一个 break 语句，否则它将失败。

switch (event.sensor.getType()) {
    case Sensor.TYPE_ACCELEROMETER:
        accelerometerValues = event.values.clone();
        tvAcc_XReading.setText(Float.toString(accelerometerValues[0]));
        tvAcc_YReading.setText(Float.toString(accelerometerValues[1]));
        tvAcc_ZReading.setText(Float.toString(accelerometerValues[2]));
        break;
    case Sensor.TYPE_MAGNETIC_FIELD:
        magnetometerValues = event.values.clone();
        tvMagneto_XReading.setText(Float.toString(magnetometerValues[0]));
        tvMagneto_YReading.setText(Float.toString(magnetometerValues[1]));
        tvMagneto_ZReading.setText(Float.toString(magnetometerValues[2]));
        break;
    }
于 2014-04-23T00:02:57.963 回答